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Available-for-Sale Investments (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Mar. 31, 2013
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Available-for-sale securities, investments: |  |
Amortized cost | $ 1,097,704 |
Gross unrealized gains | 45,613 |
Gross unrealized losses more than 12 months | (2,865) |
Gross unrealized losses less than 12 months | (26,112) |
Estimated market value | 1,114,340 | 1,095,338
U.S. treasury, government, and corporate securities |  |
Available-for-sale securities, investments: |  |
Amortized cost | 1,036,295 |
Gross unrealized gains | 42,880 |
Gross unrealized losses more than 12 months | (1,475) |
Gross unrealized losses less than 12 months | (25,692) |
Estimated market value | 1,052,008 |
U.S. treasury securities and government obligation |  |
Available-for-sale securities, investments: |  |
Amortized cost | 28,048 |
Gross unrealized gains | 1,932 |
Gross unrealized losses more than 12 months | (3) |
Gross unrealized losses less than 12 months | (293) |
Estimated market value | 29,684 |
U.S. government agency mortgage-backed securities |  |
Available-for-sale securities, investments: |  |
Amortized cost | 44,735 |
Gross unrealized gains | 2,772 |
Gross unrealized losses more than 12 months | (4) |
Gross unrealized losses less than 12 months | (1,009) |
Estimated market value | 46,494 |
Obligations of states and political subdivisions |  |
Available-for-sale securities, investments: |  |
Amortized cost | 162,678 |
Gross unrealized gains | 9,304 |
Gross unrealized losses more than 12 months | (132) |
Gross unrealized losses less than 12 months | (1,916) |
Estimated market value | 169,934 |
Corporate securities |  |
Available-for-sale securities, investments: |  |
Amortized cost | 800,834 |
Gross unrealized gains | 28,872 |
Gross unrealized losses more than 12 months | (1,336) |
Gross unrealized losses less than 12 months | (22,474) |
Estimated market value | 805,896 |
Mortgage-backed securities |  |
Available-for-sale securities, investments: |  |
Amortized cost | 5,613 |
Gross unrealized gains | 177 |
Gross unrealized losses more than 12 months | (35) |
Gross unrealized losses less than 12 months | 0 |
Estimated market value | 5,755 |
Redeemable preferred stock |  |
Available-for-sale securities, investments: |  |
Amortized cost | 18,440 |
Gross unrealized gains | 385 |
Gross unrealized losses more than 12 months | (64) |
Gross unrealized losses less than 12 months | (312) |
Estimated market value | 18,449 |
Common stock |  |
Available-for-sale securities, investments: |  |
Amortized cost | 37,356 |
Gross unrealized gains | 2,171 |
Gross unrealized losses more than 12 months | (1,291) |
Gross unrealized losses less than 12 months | (108) |
Estimated market value | $ 38,128 |

X
- Definition Net amount of accumulated unrealized gains (losses) on investments in available-for-sale securities impacted investments. Represents the difference between the fair value and cost of investments in available-for-sale securities. (Recommended by Best Practices guide 1.1.20 dated 10/4/2013, pages 43 through page 48) + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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